US5092599A - Wood golf club head - Google Patents

Wood golf club head Download PDF

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Publication number
US5092599A
US5092599A US07/510,242 US51024290A US5092599A US 5092599 A US5092599 A US 5092599A US 51024290 A US51024290 A US 51024290A US 5092599 A US5092599 A US 5092599A
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United States
Prior art keywords
club head
golf club
wood golf
dimple
face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/510,242
Inventor
Takaharu Okumoto
Tatsuo Nishimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1989045677U external-priority patent/JP2532650Y2/en
Priority claimed from JP1252223A external-priority patent/JPH03114477A/en
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Assigned to YOKOHAMA RUBBER CO., LTD., THE, A CORP. OF JAPAN reassignment YOKOHAMA RUBBER CO., LTD., THE, A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OKUMOTO, TAKAHARU, TATSUO, NISHIMOTO
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Publication of US5092599A publication Critical patent/US5092599A/en
Anticipated expiration legal-status Critical
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0437—Heads with special crown configurations
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0441—Heads with visual indicators for aligning the golf club
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0466—Heads wood-type
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/52—Details or accessories of golf clubs, bats, rackets or the like with slits
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00—Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/01—Special aerodynamic features, e.g. airfoil shapes, wings or air passages

Definitions

  • This invention relates to a wood golf club head and more particularly to a wood golf club head which improves the driving or flying distance of a hit ball and its directionality.
  • a golf club encounters air resistance when it is swung at the time of hitting of a ball and this results in the drop head speed and in a occurrence of irregular vibration of the club's shaft.
  • the drop of the head speed in turn reduces the flying distance of the hit ball and irregular vibration of the club shaft effects directionality of the hit ball.
  • Such phenomena occur particularly in a wood golf club head having a large club head and this tendency becomes all the more remarkable in those wood golf clubs whose head size becomes greater with a recent trend longer club shafts.
  • FIG. 13 shows the air flows Q that occur around a wood golf club head 1 when it is swung from the left to the right in the drawing.
  • the air flow Q flows in a direction relatively opposite to the moving direction of the wood golf club head 1, strikes a face 2 on the front surface of the club head 1, and is divided vertically into air flows Qa on the upper side surface 3 and air flows Qa on the sole side 4.
  • the air flow Qa flowing on the sole keeps the state side keeps the state is laminar because the sole surface is substantially horizontal but the air flow Qa flowing on the upper surface side undergoes layer separation of its laminar portion in the front half region of the upper surface 3 and generates large turbulent flows at the back of the position of the layer separation as shown in the drawing because the radius of curvature of the surface in the front half portion of the club head is greater than that of the sole.
  • These large turbulent flows increase the air resistance to the wood golf club head 1 and greatly change the pressure distance between the upper surface side 3 and the sole side 4, thereby causing irregular vibration of the club's shaft.
  • An object of the present invention is to provide a wood golf club head which either prevents layer separation of the air flow occurring on the upper surface of the club head or moves backward as much as possible the point where laminar separation being so as to prevent a drop in head speed and irregular vibration of the club shaft.
  • steps extending in a transverse direction are disposed on the upper surface which extends rearwardly in an arcuate form from the upper edge of the face on the front surface.
  • the steps can be formed typically by a stripe-like projection or groove extending in the transverse direction on the upper surface of the golf club head.
  • the object described above can also be accomplished by forming a dimple having a region which expands rearwardly from a position spaced apart rearwardly by a predetermined distance from the highest point of the upper surface on the upper surface and forming the step by the front edge portion of this dimple.
  • the step described above generates minute eddy flows in the air flow flowing on the upper side surface of the golf club head and these minute eddy flows prevent layer separation of the laminar flow portion of the air flow from the upper surface or greatly moves back the point of layer separation. Since a large tubulent flow does not occur in this manner, the air resistance to the golf club head decreases and the fluctuation of the pressure difference between the upper surface and the sole is reduced.
  • FIG. 1 is a plan view of a wood golf club head in accordance with an embodiment of the present invention
  • FIG. 2 is a sectional view taken along line II--II of FIG. 1;
  • FIG. 3 is a sectional view of a wood golf club head in accordance with another embodiment of the present invention and corresponds to FIG. 2;
  • FIGS. 4A to 4G are sectional views showing different shapes of steps, respectively.
  • FIG. 5 is a plan view of a wood golf club head in accordance with still another embodiment of the present invention.
  • FIG. 6 is a sectional view taken along line VI--VI of FIG. 5;
  • FIGS. 7 to 9 are plan views of wood golf club heads in accordance with other embodiments of the present invention and correspond to FIG. 5, respectively;
  • FIGS. 10 to 12 are explanatory views showing the air flow that occurs with the wood golf clubs of the present invention.
  • FIG. 13 is an explanatory view showing the air flow occurring with a conventional wood golf club head.
  • reference numeral 2 represents a face for hitting the ball which is formed on the front surface of the club head 1.
  • An upper surface 3 is formed in such a manner as to extend rearward from the upper edge of the face 2 in an arcuate form and a sole 4 is formed in such a manner as to extend rearward and substantially in a planar form from the lower edge of the face 2.
  • a stripe-like projection 6 is formed on the upper surface 3 in such a manner so that it extends across substantially the full range of its transverse direction and in conformity with the planar shape of the face 2.
  • Two steps 5, 5 are formed at the front and rear sides of this projection 6.
  • Such a projection 6 is preferably disposed across substantially the full width of the upper surface 3 but it may be partially interrupted, whenever necessary.
  • the projection 6 described above may be replaced by a groove 7 as shown in FIG. 3.
  • This groove 7 is preferably disposed in such a manner as to also extend across substantially the full range of the transverse direction of the upper surface 3 and along the planar shape of the face 2 in the same way as the projection 6 described above.
  • Two steps 5, 5 are formed in this groove 7 in the same way as the projection 6 described above.
  • minute eddy flows occur on the downstream side of the projection 6 or groove 7 as shown in FIGS. 10 and 11.
  • the minute eddy flows function in such a manner as to prevent the laminar flow portion of those air flows Qa, which branch on the upper surface 3, from separating from the upper surface 3.
  • the eddy flows prevent layer separation or moves the position, at which great layer separation otherwise occurs, to a more rearward position, and prevents the occurrence of a large turbulent flow.
  • the projection 6 or the groove 7 described above exists preferably within the range of a distance l (See FIGS. 2 and 3) of approximately 20 mm at the back of the top edge E in view of the fact that the head speed time from swing of the golf club by ordinary golfers is within the range of about 35 to about 45 m/sec.
  • the height h of the projection 6 from the upper surface 3 or the depth d of the groove 7 from the upper surface 3 is preferably within the range of 0.5 to 2.0 mm.
  • the term "top edge E" represents the boundary where the face 2 and the upper surface 3 merge with each other.
  • the shapes of the projection 6 and groove 7 are not particularly limited to those described above, and various modified forms such as shown in FIGS. 4A to 4G, for example, can be employed.
  • FIGS. 5 and 6 show another embodiment of the present invention.
  • a dimple 8 is formed on the rear half portion of the upper surface 3 and the step 5 is formed on the front edge side of this dimple 8.
  • the step 5 at the front edge portion generates the minute eddy flows such as those shown in FIG. 12 and provides the effect of the present invention in the same way as described above.
  • This dimple 8 is designed to have a relatively greater area than the groove 7 of the embodiment described above and is positioned more rearward than the groove 7.
  • the position of the dimple 8 starts at a position P R which is spaced apart rearward by a distance L from the apex P T of the arcuate curve surface of the upper surface 3, and it is recessed with a large area at that position.
  • a preferred area of this dimple 8 is at least the area of a circle C having as its diameter a distance from the position P R near to the rearmost position of the upper surface 3 and is at most the area of an ellipse formed by expanding the circle C described above to the maximum extent in the transverse direction.
  • the dimple 8 of the wood golf club head 1 shown in FIGS. 7 and 8 has an area which is in between the areas of the dimples shown in FIGS. 5 and 9.
  • L described above is preferably within the range of 10 to 20 mm in view of the fact that the head speed at the time of swing of the golf club by ordinary golfers is within the range of about 35 to about 45 m/sec, and the depth d of the dimple is preferably within the range of from 0.5 to 1.5
  • the wood golf club head in each of the embodiments described above may be made of a wood or of fiber-reinforced plastics or a metal. Though not shown in the drawings of the embodiments, a cavity can be disposed inside the wood golf club head and a weight for balance adjustment can be partially packed after a foamed body is packed into the cavity.
  • the step disposed on the club head upper surface generates the minute eddy flows in the air flow branched on the upper surface and prevents the separation of the laminar flow portion of the air flow from the upper surface or moves back the point of layer separation. Accordingly, the wood golf club head of the present invention prevents drops in head speed at the time of swing and irregular vibration of the club's shaft.

Abstract

A wood golf club head equipped with steps which extend transversely on an upper surface of the head or a single large dimple of specific dimensions and location that extends over the rear portion of the upper surface of the club head.

Description

BACKGROUND OF THE INVENTION
This invention relates to a wood golf club head and more particularly to a wood golf club head which improves the driving or flying distance of a hit ball and its directionality.
A golf club encounters air resistance when it is swung at the time of hitting of a ball and this results in the drop head speed and in a occurrence of irregular vibration of the club's shaft. The drop of the head speed in turn reduces the flying distance of the hit ball and irregular vibration of the club shaft effects directionality of the hit ball. Such phenomena occur particularly in a wood golf club head having a large club head and this tendency becomes all the more remarkable in those wood golf clubs whose head size becomes greater with a recent trend longer club shafts.
An analysis made by the inventors of the present invention reveals that the phenomena described above are mainly caused by layer separation of the air flow that flows on an upper surface side of the club head as shown in FIG. 13 of the accompanying drawings. FIG. 13 shows the air flows Q that occur around a wood golf club head 1 when it is swung from the left to the right in the drawing. The air flow Q flows in a direction relatively opposite to the moving direction of the wood golf club head 1, strikes a face 2 on the front surface of the club head 1, and is divided vertically into air flows Qa on the upper side surface 3 and air flows Qa on the sole side 4. Of these air flows, the air flow Qa flowing on the sole keeps the state side keeps the state is laminar because the sole surface is substantially horizontal but the air flow Qa flowing on the upper surface side undergoes layer separation of its laminar portion in the front half region of the upper surface 3 and generates large turbulent flows at the back of the position of the layer separation as shown in the drawing because the radius of curvature of the surface in the front half portion of the club head is greater than that of the sole. These large turbulent flows increase the air resistance to the wood golf club head 1 and greatly change the pressure distance between the upper surface side 3 and the sole side 4, thereby causing irregular vibration of the club's shaft.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a wood golf club head which either prevents layer separation of the air flow occurring on the upper surface of the club head or moves backward as much as possible the point where laminar separation being so as to prevent a drop in head speed and irregular vibration of the club shaft.
In order to accomplish the object described above, in the wood golf club head in accordance with the present invention, steps extending in a transverse direction are disposed on the upper surface which extends rearwardly in an arcuate form from the upper edge of the face on the front surface. The steps can be formed typically by a stripe-like projection or groove extending in the transverse direction on the upper surface of the golf club head. The object described above can also be accomplished by forming a dimple having a region which expands rearwardly from a position spaced apart rearwardly by a predetermined distance from the highest point of the upper surface on the upper surface and forming the step by the front edge portion of this dimple.
The step described above generates minute eddy flows in the air flow flowing on the upper side surface of the golf club head and these minute eddy flows prevent layer separation of the laminar flow portion of the air flow from the upper surface or greatly moves back the point of layer separation. Since a large tubulent flow does not occur in this manner, the air resistance to the golf club head decreases and the fluctuation of the pressure difference between the upper surface and the sole is reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a wood golf club head in accordance with an embodiment of the present invention;
FIG. 2 is a sectional view taken along line II--II of FIG. 1;
FIG. 3 is a sectional view of a wood golf club head in accordance with another embodiment of the present invention and corresponds to FIG. 2;
FIGS. 4A to 4G are sectional views showing different shapes of steps, respectively;
FIG. 5 is a plan view of a wood golf club head in accordance with still another embodiment of the present invention;
FIG. 6 is a sectional view taken along line VI--VI of FIG. 5;
FIGS. 7 to 9 are plan views of wood golf club heads in accordance with other embodiments of the present invention and correspond to FIG. 5, respectively;
FIGS. 10 to 12 are explanatory views showing the air flow that occurs with the wood golf clubs of the present invention; and
FIG. 13 is an explanatory view showing the air flow occurring with a conventional wood golf club head.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the wood golf club head shown in FIGS. 1 and 2, reference numeral 2 represents a face for hitting the ball which is formed on the front surface of the club head 1. An upper surface 3 is formed in such a manner as to extend rearward from the upper edge of the face 2 in an arcuate form and a sole 4 is formed in such a manner as to extend rearward and substantially in a planar form from the lower edge of the face 2. A stripe-like projection 6 is formed on the upper surface 3 in such a manner so that it extends across substantially the full range of its transverse direction and in conformity with the planar shape of the face 2. Two steps 5, 5 are formed at the front and rear sides of this projection 6. Such a projection 6 is preferably disposed across substantially the full width of the upper surface 3 but it may be partially interrupted, whenever necessary.
The projection 6 described above may be replaced by a groove 7 as shown in FIG. 3. This groove 7 is preferably disposed in such a manner as to also extend across substantially the full range of the transverse direction of the upper surface 3 and along the planar shape of the face 2 in the same way as the projection 6 described above. Two steps 5, 5 are formed in this groove 7 in the same way as the projection 6 described above.
When a player swings a wood golf club head equipped with the projection 6 or groove 7 having these steps 5, minute eddy flows occur on the downstream side of the projection 6 or groove 7 as shown in FIGS. 10 and 11. The minute eddy flows function in such a manner as to prevent the laminar flow portion of those air flows Qa, which branch on the upper surface 3, from separating from the upper surface 3. In other words, the eddy flows prevent layer separation or moves the position, at which great layer separation otherwise occurs, to a more rearward position, and prevents the occurrence of a large turbulent flow.
In order to generate most effectively the effect described above, the projection 6 or the groove 7 described above exists preferably within the range of a distance l (See FIGS. 2 and 3) of approximately 20 mm at the back of the top edge E in view of the fact that the head speed time from swing of the golf club by ordinary golfers is within the range of about 35 to about 45 m/sec. Further, the height h of the projection 6 from the upper surface 3 or the depth d of the groove 7 from the upper surface 3 is preferably within the range of 0.5 to 2.0 mm. Here, the term "top edge E" represents the boundary where the face 2 and the upper surface 3 merge with each other.
The shapes of the projection 6 and groove 7 are not particularly limited to those described above, and various modified forms such as shown in FIGS. 4A to 4G, for example, can be employed.
FIGS. 5 and 6 show another embodiment of the present invention.
In the wood golf club head 1 of this embodiment, a dimple 8 is formed on the rear half portion of the upper surface 3 and the step 5 is formed on the front edge side of this dimple 8. The step 5 at the front edge portion generates the minute eddy flows such as those shown in FIG. 12 and provides the effect of the present invention in the same way as described above.
This dimple 8 is designed to have a relatively greater area than the groove 7 of the embodiment described above and is positioned more rearward than the groove 7. In other words, the position of the dimple 8 starts at a position PR which is spaced apart rearward by a distance L from the apex PT of the arcuate curve surface of the upper surface 3, and it is recessed with a large area at that position. A preferred area of this dimple 8 is at least the area of a circle C having as its diameter a distance from the position PR near to the rearmost position of the upper surface 3 and is at most the area of an ellipse formed by expanding the circle C described above to the maximum extent in the transverse direction. The dimple 8 of the wood golf club head 1 shown in FIGS. 7 and 8 has an area which is in between the areas of the dimples shown in FIGS. 5 and 9.
In order to generate effectively the effect brought forth by the step 5 of such a dimple 8, L described above is preferably within the range of 10 to 20 mm in view of the fact that the head speed at the time of swing of the golf club by ordinary golfers is within the range of about 35 to about 45 m/sec, and the depth d of the dimple is preferably within the range of from 0.5 to 1.5
The wood golf club head in each of the embodiments described above may be made of a wood or of fiber-reinforced plastics or a metal. Though not shown in the drawings of the embodiments, a cavity can be disposed inside the wood golf club head and a weight for balance adjustment can be partially packed after a foamed body is packed into the cavity.
In the wood golf club head in accordance with the present invention described above, the step disposed on the club head upper surface generates the minute eddy flows in the air flow branched on the upper surface and prevents the separation of the laminar flow portion of the air flow from the upper surface or moves back the point of layer separation. Accordingly, the wood golf club head of the present invention prevents drops in head speed at the time of swing and irregular vibration of the club's shaft.

Claims (3)

What is claimed is:
1. A wood golf club head comprising:
a face for hitting a ball on a front surface of said wood golf club head;
a sole surface extending rearwardly from a lower edge of said face;
an upper surface extending rearwardly from an upper edge of said face and having a convex curved shape with an apex and an exposed single dimple spread out over a rear portion of the upper surface of the head, said dimple beginning at a point from 10 to 20 mm rearwardly from the apex of said curved upper surface, having a depth from said upper surface of from 0.5 to 1.5 mm and extending rearwardly at least over an area equivalent to the area of a circle having a diameter equal to the distance from said beginning point to a point adjacent a rearmost edge of said upper surface.
2. The wood golf club head of claim 1, wherein the dimple forms a circle.
3. The wood golf club head of claim 1, wherein the dimple has an elliptical shape having a front edge extending generally parallel to the upper edge of the face and extending over most of the rear portion of the upper surface of the club head rearwardly of said front edge of the dimple.
US07/510,242 1989-04-20 1990-04-17 Wood golf club head Expired - Fee Related US5092599A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP1989045677U JP2532650Y2 (en) 1989-04-20 1989-04-20 Wood Golf Club Head
JP1-45677[U] 1989-04-30
JP1-252223 1989-09-29
JP1252223A JPH03114477A (en) 1989-09-29 1989-09-29 Head of wood golf club

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US5092599A true US5092599A (en) 1992-03-03

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Cited By (87)

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US5193810A (en) * 1991-11-07 1993-03-16 Antonious A J Wood type aerodynamic golf club head having an air foil member on the upper surface
US5221086A (en) * 1992-06-04 1993-06-22 Antonious A J Wood type golf club head with aerodynamic configuration
US5288079A (en) * 1990-11-29 1994-02-22 Maruman Golf Kabushiki Kaisha Golf wood clubhead
US5326105A (en) * 1993-05-20 1994-07-05 Fenton Golf, Inc. Sea plane sole for a golf club
US5354056A (en) * 1993-03-18 1994-10-11 Bradley K. Stone Golf club and method
US5398935A (en) * 1990-11-29 1995-03-21 Maruman Golf Kabushiki Kaisha Golf wood clubhead
US5511786A (en) * 1994-09-19 1996-04-30 Antonious; Anthony J. Wood type aerodynamic golf club head having an air foil member on the upper surface
USD378770S (en) * 1995-03-01 1997-04-08 Wilson Sporting Goods Co. Clubhead
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USD425158S (en) 1999-01-28 2000-05-16 Cobra Golf Incorporated Golf club head
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US9168432B2 (en) 2011-10-31 2015-10-27 Karsten Manufacturing Corporation Golf club heads with turbulators and methods to manufacture golf club heads with turbulators
US9211448B2 (en) 2011-08-10 2015-12-15 Acushnet Company Golf club head with flexure
USD754271S1 (en) 2012-06-28 2016-04-19 Karsten Manufacturing Corporation Golf club head
US9320949B2 (en) 2006-10-25 2016-04-26 Acushnet Company Golf club head with flexure
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